US9755533B2ActiveUtilityPatentIndex 72
Resonant inverter and resonant power source unit
Est. expiryMay 12, 2035(~8.9 yrs left)· nominal 20-yr term from priority
Inventors:IMAI KATSUNORI
H02M 2001/0058H02M 3/335H02M 3/33569Y02B70/1433H02M 3/015H02M 3/01H02M 1/0058Y02B70/10
72
PatentIndex Score
4
Cited by
8
References
22
Claims
Abstract
A resonant inverter is provided that includes a first switch and a second switch alternately turned on and off, a first inverter including the first switch and a first resonant circuit including a first coil and a first capacitor, and a second inverter including the second switch and a second resonant circuit including a second coil and a second capacitor. The first coil, the second coil, and a third capacitor constitute a third resonant circuit.
Claims
exact text as granted — not AI-modifiedWhat is claimed is:
1. A resonant inverter comprising:
a first switch and a second switch alternately turned on and off;
a first inverter including the first switch and a first resonant circuit including a first coil and a first capacitor; and
a second inverter including the second switch and a second resonant circuit including a second coil and a second capacitor,
wherein the first coil, the second coil, and a third capacitor constitute a third resonant circuit.
2. The resonant inverter according to claim 1 ,
wherein the first capacitor is connected in parallel to the first switch,
the second capacitor is connected in parallel to the second switch,
the first coil is provided between the first switch and a first input terminal,
the second coil is provided between the second switch and the first input terminal, and
the third capacitor is provided between the first switch and the second switch,
and connected in parallel to the first coil and the second coil connected in series to each other.
3. The resonant inverter according to claim 2 , further comprising a fourth capacitor and a third coil provided between the first switch and the second switch, and constituting a fourth resonant circuit.
4. The resonant inverter according to claim 2 , further comprising a fifth resonant circuit including a fifth coil provided parallel to the first switch and a fifth capacitor, the fifth coil and the fifth capacitor being connected in series, and a sixth resonant circuit including a sixth coil provided parallel to the second switch and a sixth capacitor, the sixth coil and the sixth capacitor being connected in series.
5. The resonant inverter according to claim 1 , further comprising a fourth capacitor and a third coil provided between the first switch and the second switch, and constituting a fourth resonant circuit.
6. The resonant inverter according to claim 1 , further comprising a fifth resonant circuit including a fifth coil provided parallel to the first switch and a fifth capacitor, the fifth coil and the fifth capacitor being connected in series, and a sixth resonant circuit including a sixth coil provided parallel to the second switch and a sixth capacitor, the sixth coil and the sixth capacitor being connected in series.
7. The resonant inverter according to claim 1 ,
wherein a capacitance Cf of the third capacitor satisfies an equation (1), where Lf denotes inductance of the first coil and the second coil, and Fs denotes a driving frequency of the first and second switches:
1
4
π
2
2
L
f
(
2
F
s
)
2
≤
C
f
≤
1
4
π
2
2
L
f
(
3
F
s
)
2
.
(
1
)
8. The resonant inverter according to claim 1 ,
wherein each of the first capacitor, the second capacitor, and the third capacitor is a variable capacitor.
9. A resonant power source unit comprising:
the resonant inverter according to claim 1 ; and
a resonant rectifier connected to the resonant inverter.
10. A resonant inverter comprising:
a first switch and a second switch alternately turned on and off, and a transformer including a first winding and a second winding on a primary side;
a first inverter including the first switch and a first resonant circuit including a first coil and a first capacitor; and
a second inverter including the second switch and a second resonant circuit including a second coil and a second capacitor,
wherein the first coil, the second coil, and a third capacitor constitute a third resonant circuit.
11. The resonant inverter according to claim 10 ,
wherein the first capacitor is connected in parallel to the first switch,
the second capacitor is connected in parallel to the second switch,
the first coil is connected to the first switch and one end of the first winding of the transformer,
the second coil is connected to the second switch and one end of the second winding of the transformer, and
the third capacitor is provided between the first switch and the second switch.
12. The resonant inverter according to claim 11 , further comprising a fourth capacitor and a third coil provided between the first switch and the second switch and constituting a fourth resonant circuit.
13. The resonant inverter according to claim 11 , further comprising a fifth resonant circuit including a fifth coil provided parallel to the first switch and a fifth capacitor, the fifth coil and the fifth capacitor being connected in series, and a sixth resonant circuit including a sixth coil provided parallel to the second switch and a sixth capacitor, the sixth coil and the sixth capacitor being connected in series.
14. The resonant inverter according to claim 10 , further comprising a fourth capacitor and a third coil provided between the first switch and the second switch and constituting a fourth resonant circuit.
15. The resonant inverter according to claim 10 , further comprising a fifth resonant circuit including a fifth coil provided parallel to the first switch and a fifth capacitor, the fifth coil and the fifth capacitor being connected in series, and a sixth resonant circuit including a sixth coil provided parallel to the second switch and a sixth capacitor, the sixth coil and the sixth capacitor being connected in series.
16. The resonant inverter according to claim 10 , further comprising a seventh resonant circuit including the first coil, the second coil, the first winding of the transformer, the second winding of the transformer, and the third capacitor.
17. The resonant inverter according to claim 10 ,
wherein the first coil and the second coil is constituted of leakage inductance of the transformer.
18. The resonant inverter according to claim 10 ,
wherein a center tap provided between the first winding and the second winding of the transformer is connected to an input terminal to which an input voltage is applied.
19. A resonant power source unit comprising:
the resonant inverter according to claim 10 ; and
a resonant rectifier connected to the resonant inverter,
wherein the resonant rectifier includes a plurality of resonant rectifier circuits, and
the resonant rectifier circuits are respectively provided between the first switch and a first winding of the transformer and between the second switch and a second winding of the transformer.
20. The resonant inverter according to claim 10 ,
wherein a capacitance Cf of the third capacitor satisfies an equation (1), where Lf denotes inductance of the first coil and the second coil, and Fs denotes a driving frequency of the first and second switches:
1
4
π
2
2
L
f
(
2
F
s
)
2
≤
C
f
≤
1
4
π
2
2
L
f
(
3
F
s
)
2
.
(
1
)
21. The resonant inverter according to claim 10 ,
wherein each of the first capacitor, the second capacitor, and the third capacitor is a variable capacitor.
22. A resonant power source unit comprising:
the resonant inverter according to claim 10 ; and
a resonant rectifier connected to the resonant inverter.Cited by (0)
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